北京市西部及北部群山环绕,山区范围广阔,山地面积为平原的二倍,占全市面积62%。山区自然资源十分丰富,土壤资源也各具特色,从保持生态平衡、改善生活环境、保障生产和生活水源及发展农、林、牧、副各项生产来讲,研究山地土壤资源的合理利用问题是十 Surrounded by the mountains in the west and north of Beijing, the mountainous area covers a vast area and the mountainous area is double that of the plain, accounting for 62% of the city. Mountainous area is rich in natural resources, soil resources also have their own characteristics, from maintaining the ecological balance, improving the living environment, safeguarding the production and living water sources and the development of agriculture, forestry, animal husbandry and deputy production, in terms of the reasonable utilization of mountain soil resources Is ten